32 lines
944 B
Factor
32 lines
944 B
Factor
! Copyright (C) 2005, 2009 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: fry help.markup help.topics kernel math sequences ;
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IN: help.crossref
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: article-links ( topic elements -- seq )
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[ article-content ] dip collect-elements ;
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: article-children ( topic -- seq )
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{ $subsection $subsections } article-links [ >link ] map ;
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: help-path ( topic -- seq )
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[ article-parent ] follow rest ;
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: set-article-parents ( parent article -- )
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article-children [ set-article-parent ] with each ;
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: xref-article ( topic -- )
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dup set-article-parents ;
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: prev/next ( obj seq n -- obj' )
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[ [ index dup ] keep ] dip swap
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'[ _ + _ ?nth ] when ;
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: prev/next-article ( article n -- article' )
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[ dup article-parent dup ] dip
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'[ article-children _ prev/next ] [ 2drop f ] if ;
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: prev-article ( article -- prev ) -1 prev/next-article ;
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: next-article ( article -- next ) 1 prev/next-article ;
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